应用激光, 2019, 39 (5): 866, 网络出版: 2019-12-05
基于多信号叠加和伪逆法的激光拉曼气体检测方法
Laser Raman Gas Detection Method based on Multi-Signal Superposition and Pseudo-Inverse Method
摘要
现有的激光拉曼气体检测(LRGD)系统受到系统噪声的影响, 对低浓度气体的检测精度较差。为了提高LRGD系统对低浓度气体的检测精度, 提出了一种基于多信号叠加和伪逆法的激光拉曼气体检测(MSSPI)方法。具体地说, 对于低浓度气体, 通过拉曼信号叠加的方式增强抵抗系统噪声的能力, 检测装置检测叠加的拉曼信号, 使用伪逆法重构单气体的拉曼信号值, 进而获取气体浓度。实验结果表明, 基于MSSPI方法的LRGD系统提高了对低浓度气体的检测精度。MSSPI方法不改变LRGD系统, 计算简单高效, 在一定程度上降低了系统对低浓度气体的检测误差, 可以作为气体检测中的一种辅助方法。
Abstract
The existing laser Raman gas detection (LRGD) system is affected by system noise, and the detection accuracy of low concentration gas is poor. In order to improve the detection accuracy of the LRGD system for low concentration gas, a laser Raman gas detection method based on multi-signal superposition and pseudo inverse method (MSSPI) is proposed. Specifically, for low concentration gas, the ability of resisting system noise is enhanced by Raman signal superposition. The signal detection module is used to detect the superimposed Raman signal. The Raman signal of the single gas is reconstructed by the pseudo-inverse method, then the gas concentration is calculated by the corresponding formula. The experimental results show that the LRGD system with the MSSPI method improves detection accuracy of the low concentration gas. The MSSPI method does not change the existing LRGD system, the calculation is simple and efficient, which reduces the detection error to a certain extent. The proposed method can be used as an auxiliary method for gas detection.
张雷洪, 徐润初, 张大伟. 基于多信号叠加和伪逆法的激光拉曼气体检测方法[J]. 应用激光, 2019, 39(5): 866. Zhang Leihong, Xu Runchu, Zhang Dawei. Laser Raman Gas Detection Method based on Multi-Signal Superposition and Pseudo-Inverse Method[J]. APPLIED LASER, 2019, 39(5): 866.